C2 Flashcards
what does the hammer mode of a hammer drill do?
Drill threw concrete
hammer drills are capable of drilling what size holes?
20mm (3/4”)
Rotary Hammers have what modes?
Hammer only, Rotary Hammer, rotary only
rotary drills are capable of drilling what size holes?
50mm (2”)
What should you use to ensure the exact depth specified by the manufacturer?
Depth Gauge
What are core bits used for?
Drilling large diameter holes 50-150mm (2-6”)
what are the teeth of a core bit?
Industrial Diamonds
Largest diamter holes are drilled with what?
Rig-mounted coring drill can drill up too 350mm (14”)
What precautions should be taken when handling carbide tipped bits?
They tend too be brittle and snap if forced with too much pressure
How are angle grinders sized?
By the maximum wheel size they can Handel (4.5-7”)
What three types of wheels are there for cutting metal?
Ferrous metal wheels (cast-iron, steel)
Non-ferrous metal wheels (brass, copper, aluminum)
Cut-off wheels (zip disk)
What three types of concrete cutting wheels?
Wheels for cuttting masonry, stucco, plaster
Concrete grinding wheels
Abrasive cup wheels
wire wheels and cups are used for what?
grinding the surface of metal for painting
RPM on the wheel must be lower than the grinder true or false?
True
power trowel sizes are determined by what?
the diameter of the circle made usually 24-48”
how wide is the range of a ride on power trowel?
up too 1.5 m (60”)
what are the two basic blades of a power trowel?
floats and trowel blades
what are floats used for?
used for final levelling of the concrete surface before finishing
what are trowel blades used for?
producing a mirror like finish on the concrete surface
when do you start the finishing process?
when all the bleed water has evaporated
how do you move a power trowel while running?
lifting or pressing down on the handles will laterally move the machine
how do you change the angle of the blade?
turning the Blade Adjustment
what does burnished surface mean?
a smooth mirror like finish
list five procedures used when finishing a concrete slab
- concrete is level
- concrete has support
- bleed water has evaporated
- use uniform movements of the trowel
- allow for hardening between passes
